/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.streaming.connectors.kinesis.examples;

import org.apache.flink.api.common.serialization.SimpleStringSchema;
import org.apache.flink.api.java.utils.ParameterTool;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.source.SourceFunction;
import org.apache.flink.streaming.connectors.kinesis.FlinkKinesisProducer;
import org.apache.flink.streaming.connectors.kinesis.config.AWSConfigConstants;

import org.apache.commons.lang3.RandomStringUtils;

import java.util.Properties;

/** This is an example on how to produce data into Kinesis. */
public class ProduceIntoKinesis {

    public static void main(String[] args) throws Exception {
        ParameterTool pt = ParameterTool.fromArgs(args);

        StreamExecutionEnvironment see = StreamExecutionEnvironment.getExecutionEnvironment();
        see.setParallelism(1);

        DataStream<String> simpleStringStream = see.addSource(new EventsGenerator());

        Properties kinesisProducerConfig = new Properties();
        kinesisProducerConfig.setProperty(AWSConfigConstants.AWS_REGION, pt.getRequired("region"));
        kinesisProducerConfig.setProperty(
                AWSConfigConstants.AWS_ACCESS_KEY_ID, pt.getRequired("accessKey"));
        kinesisProducerConfig.setProperty(
                AWSConfigConstants.AWS_SECRET_ACCESS_KEY, pt.getRequired("secretKey"));

        FlinkKinesisProducer<String> kinesis =
                new FlinkKinesisProducer<>(new SimpleStringSchema(), kinesisProducerConfig);

        kinesis.setFailOnError(true);
        kinesis.setDefaultStream("flink-test");
        kinesis.setDefaultPartition("0");

        simpleStringStream.addSink(kinesis);

        see.execute();
    }

    /**
     * Data generator that creates strings starting with a sequence number followed by a dash and 12
     * random characters.
     */
    public static class EventsGenerator implements SourceFunction<String> {
        private boolean running = true;

        @Override
        public void run(SourceContext<String> ctx) throws Exception {
            long seq = 0;
            while (running) {
                Thread.sleep(10);
                ctx.collect((seq++) + "-" + RandomStringUtils.randomAlphabetic(12));
            }
        }

        @Override
        public void cancel() {
            running = false;
        }
    }
}
